MBS-7064: Do not create on old edit link type edits

Some old edit link type edits have "parent_id = performer", where as we
expect parent_id to be an integer. For edits where parent_id does not
look like a number, we now set the parent_id to be undefined, which
prevents an exception from being thrown.
mbs-7390: ArtistsThatMayBeGroups report needs to ignore orchestras and choirs
mbs-7391: remove verbiage from /entity/create, add doc links where missing
mbs-7391: the only use of "new" is gone
fix high-res mora.jp links

fixes links like http://mora.jp/package/43000021/SQEX-20016_F/ being replaced with http://mora.jp/package/43000021/SQEX-20016/
Add test case for high-res mora.jp link fixing.
changed the order of _ and - to exclude confusion in the future
mbs-7391: change all forms to use link_entity
MBS-7395: Works that still have work attributes can't be deleted
mbs-7391: turn pointless lists into paragraphs. Also stop rg/delete from entering edits
Allow moving/clearing seeded TOCs (also fixes MBS-7386)
mbs-7391: ian's nitpicks
mbs-7392: activate the place duplicate finder
Refactor Entity::Types to use a loop instead of repeating the same thing over and over again.
Merge branch 'master' into mbs-7064
MBS-7064: don't outright throw out parent information
MBS-7064: default to 0 for undefined parent_id so those produce undef, rather than a LinkType row of name undef.
MBS-7410: Show correct merge queue help text

Fix two typos in the test whether a merge queue is ready, i.e. has at
least two entities (was "merge.reday_to_merge" instead of
"merger.ready_to_merge"). This meant that a wrong help text was shown.
MBS-7150: Show artist credits on ratings pages

On users' ratings pages, display artist credits (via descriptive_link)
for entities that have them.
Replace legacy code for displaying artist credits

Some templates for tag pages predated the introduction of the
descriptive_link macro and used ad-hoc code to display artist credits
instead. Make them use descriptive_link, too.